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APA Citation
Sanderson, J. C., Devine, E. B., Lipton, R. B., Bloudek, L. M., Varon, S. F., Blumenfeld, A. M., Goadsby, P. J., Buse, D. C., & Sullivan, S. D. (2013). headache-related health resource utilisation in chronic and episodic migraine across six countries. Journal of neurology, neurosurgery and psychiatry, 84(12), 1309–1317. http://access.bl.uk/ark:/81055/vdc_100135568947.0x000042